5 resistance bands

Resistance band resistancebands with ankle trap, door anchor,fabric storagebagfeatures:*1 yellow elastic(5-6lbs)*1 green elastic(7.5-8.5lbs)*1 red elastic (10.5-12lbs)*1 blue elastic (15-18lbs)*1 black elastic (22lbs)*2 foam covered handles*1 door anchorhow does door anchor workhold the soft foam end by the door opening,place the foam end in between the door and door frame and shut the door, open the loop on the end which comes through the door, thread the elastic, through the loop- that is it.....you are in!How does exercise band work?For example, when you begin an exercise like Biceps curl and your arm is straight, the yellow elastic produce 5 lbs of tension, by the end of the movement when your arm is bend and the elastic is stretched, the same elastic is producing 6lbs of tension. the works is same ways of the other color elastic.This bands systems come with 4 or 5 bands, each band is a different thickness which ends up creating a different level of tension. when you want to perform an exercise you simply clip the elastics on to the ankle straps or handles. Since every elastic has the clip, you can use themindividually or combined to creat many different levels of tension.Material of exercise band:latex tubing, foam, metal clip, it is 125mm